You are advertising your network’s assigned prefixes to two upstream ISPs using BGP. You want
incoming traffic to prefer ISP-A over ISP-B.
Which action would you take to accomplish this task?
A.
Set a higher local preference on the prefixes you announce to ISP-A.
B.
Using a routing policy, prepend your ASN information to the AS path attribute on prefixes you
announce to ISP-B.
C.
Using a routing policy, prepend your ASN information to the AS path attribute on prefixes you
announce to ISP-A.
D.
Set the MED value lower on prefixes you announce to ISP-A.
D
It is B. You prepend the AS-path on prefixes toward B in order to set that AS-path longer.
Shortest as-path is always prefered, so by doing so, incoming traffic will prefer ISP A.
right B
MED is wrong, because ISP A and ISP B have different ASN -s. In this case you have to prepend to influence the incomming traffic. The B is the correct answer.
D? either way of B or C?